function my_wp_rss( $url, $num_items = -1 ) {
	$return = '';
	if ( $rss = fetch_rss( $url ) ) {
		$return .= '<ul>';

		if ( $num_items !== -1 ) {
			$rss->items = array_slice( $rss->items, 0, $num_items );
		}

		foreach ( $rss->items as $item ) {
			$return .= sprintf(
				'<li><a href="%1$s" title="%2$s" rel="nofollow">%3$s</a></li>',
				clean_url( $item['link'] ),
				attribute_escape( strip_tags( $item['description'] ) ),
				htmlentities( $item['title'] )
			);
		}

		$return .= '</ul>';
	} else {
		$return .=__( 'An error has occurred, which probably means the feed is down. Try again later.' );
	}
	return $return;
}

include_once(ABSPATH.WPINC.'/rss.php');

function readRss($atts) {
	extract(shortcode_atts(array(
		"feed" => 'http://',
		"num" => '1',
	), $atts));

	return my_wp_rss($feed, $num);
}

add_shortcode('rss', 'readRss');

And still use the shortcode like you did before:
[rss feed="http://feeds.feedburner.com/wprecipes" num="5"]

include_once(ABSPATH.WPINC.’/rss.php’);

function readRss($atts) {
extract(shortcode_atts(array(
“feed” => ‘http://’,
“num” => ‘1′,
), $atts));

return wp_rss($feed, $num);
}

add_shortcode(‘rss’, ‘readRss’);

And Shortcode =
[rss feed="http://feeds.feedburner.com/wprecipes" num="5"]

Your post was very helpful. I am having a little problem with shortcodes on my website though.

I have [rss feed="http://feeds.digg.com/digg/popular.rss"] which call a fucntion that displays feeds on to my page.

The feeds are working, however they move right to the top of my content page instead. (check sosmos.com/testing). How can i fix this?

Thanks!!

echo do_shortcode('some text with a [shortcode] to process');

If you want to process comments though, just add it as a filter to the comment text like this:

add_filter('comment_text', 'do_shortcode');

You may want to give it a high priority (high number means it runs later) so that it runs AFTER wpautop runs like this:

add_filter('comment_text', 'do_shortcode', 35);

You should be able to put either of those into your theme’s functions.php file or run it on init from a plugin.

I see that there could be security risks with this, but I’m just making sure.

Thx.

Any idea how to make meta box work correctly in such case? I tried but it sends [shortcode [id="value"] which is incorrect.